Tangle babel code to specific location in source file?

Question

Let's say I'm creating many babel code blocks in a growing org-mode buffer and I'm tangling them all to a single file. However, I want certain blocks to appear above others. For example,

#+begin_src haskell :eval never :exports code :tangle fp41.hs
module FP41 where
import Data.List
#+end_src

#+begin_src haskell :eval never :exports code :tangle fp41.hs
data Mood = Blah | Woot deriving (Show, Eq)

changeMood Blah = Woot
changeMood _ = Blah
#+end_src

This works wonderfully, but I always have to watch what order the blocks are int to avoid spaghetti code. So what if I want to add another import way down in the buffer

#+begin_src haskell :eval never :exports code :tangle fp41.hs
import GHC.Int
#+end_src

but not have it below regular code in the tangled file? That is, I want it going to the header block in the tangled code file fp41.hs, grouped/following the previous last import. I could tangle them to separate files -- one for "header" stuff, one for code. If that's the route, is there any way then to automate combining them into a single file?

Answer 1

There doesn't appear to be an exact solution, but the next-best thing would be something like this

* Test
:PROPERTIES:
:header-args: :noweb-sep "\n\n"
:END:

#+begin_src haskell :eval never :tangle nowebtest.hs :noweb yes
module FP41 where
import Data.List
<<ghcInt-imp>>
<<mood>>
#+end_src

#+name: mood
#+begin_src haskell :eval never

data Mood = Blah | Woot deriving (Show, Eq)

changeMood Blah = Woot
changeMood _ = Blah
#+end_src

#+name: ghcInt-imp
#+begin_src haskell :eval never
import GHC.Int
#+end_src

following the noweb docs here. This produces what's needed

module FP41 where
import Data.List
import GHC.Int

data Mood = Blah | Woot deriving (Show, Eq)

changeMood Blah = Woot
changeMood _ = Blah

although that :noweb-sep doesn't seem to work and I don't find anything on it other than it's mention.